摘要
相位差变化率是最近提出的用于快速无源定位的观测量。分析了相位差变化率的特点 ,提出了相位差变化率的测量原理 ,从理论上分析了相位差变化率测量精度的Cramer-Rao界 ,指出了过窄的源信号脉冲宽度和过低的相位差变化率是造成相位差变化率测量困难的主要原因 ,并对此提出了解决的方法 ,随后进行的测量精度对比仿真分析表明 ,该方法是有效的。
By employing the new measurement information-rate(derivative)of phase difference measured by two-element antenna array(interferometer), a passive location system can find the position of enemy emitters more quickly with higher precision. But the precision of phase difference rate is critical to this passive location system. In this paper, the feature of phase difference rate is discussed first, a method for measuring it is presented. Then Cramer-Rao bound for measure variance is given. For the pulse width of source signal is too small and the phase difference rate is too low, the measure variance is too large. Account for this, an improved method is proposed and its precision is analyzed by simulation.
出处
《系统工程与电子技术》
EI
CSCD
北大核心
2001年第1期20-23,共4页
Systems Engineering and Electronics
